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Article
Open AccessTomography-based digital twin of Nd-Fe-B permanent magnets
Many functional materials have been designed at the multiscale level. To properly simulate their physical properties, large and sophisticated computer models that can replicate microstructural features with na...
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Article
Open AccessUnveiling the origin of the large coercivity in (Nd, Dy)-Fe-B sintered magnets
Nd-Fe-B-based permanent magnets are widely used for energy conversion applications. However, their usage at elevated temperatures is difficult due to the relatively low coercivity (Hc) with respect to the anisotr...
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Article
Open AccessReal picture of magnetic domain dynamics along the magnetic hysteresis curve inside an advanced permanent magnet
In the long history of permanent magnet research for more than 100 years, three-dimensional magnetic microscopy has been eagerly awaited to elucidate the origin of the magnetic hysteresis of permanent magnets....
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Chapter and Conference Paper
Unlocking the Strengthening Potential of Magnesium Alloys Using Deformation-Induced Clustering and Precipitation
Light metals of Aluminum (Al) and Magnesium (Mg) hold great promise in many structural applications [1–6]. However, the overall progress in strengthening these metals has been remarkably different. While signific...
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Chapter
Design and Development of Novel Wrought Magnesium Alloys
Magnesium alloys are one of the lightest commercial metals, and applications of wrought magnesium alloys may lead to a substantial weight reduction of transportation vehicles. However, applications of wrought ...
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Article
Open AccessHierarchical microstructure strengthening in a single crystal high entropy superalloy
A hierarchical microstructure strengthened high entropy superalloy (HESA) with superior cost specific yield strength from room temperature up to 1,023 K is presented. By phase transformation pathway through me...
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Article
High voltage-controlled magnetic anisotropy and interface magnetoelectric effect in sputtered multilayers annealed at high temperatures
Voltage control of magnetism promises great energy efficiency in writing magnetic memory. Here, using Cr/Mo/CoFeB/MgO multilayers stable under high annealing temperatures up to 590°C, we significantly enhance ...
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Article
Open AccessChange of Deformation Mechanisms Leading to High Strength and Large Ductility in Mg-Zn-Zr-Ca Alloy with Fully Recrystallized Ultrafine Grained Microstructures
Recently, we have found that fully recrystallized ultrafine-grained (UFG) microstructures could be realized in a commercial precipitation-hardened Magnesium (Mg) alloy. The UFG specimens exhibited high strengt...
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Article
Open AccessVoltage-Controlled Magnetic Anisotropy in Fe1−xCox/Pd/MgO system
Voltage-controlled magnetic anisotropy (VCMA) in an epitaxially grown Fe/Fe1−xCox/Pd/MgO system was investigated using spin-wave spectroscopy. The spin-wave resonant frequency linearly depended on the bias-voltag...
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Article
Materials for spin-transfer-torque magnetoresistive random-access memory
Spin-transfer-torque magnetoresistive random-access memory (STT-MRAM) is an emerging nonvolatile memory that uses magnetic tunnel junctions (MTJs) to store information. MTJs with a crystalline MgO(001) tunnel ...
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Article
Read sensor technology for ultrahigh density magnetic recording
This article reviews progress in magnetoresistive (MR) read sensor technology for hard-disk drives (HDDs). MR reader technology has progressed from the anisotropic magnetoresistance sensor, to the current-in-p...
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Article
Open AccessHighly efficient voltage control of spin and enhanced interfacial perpendicular magnetic anisotropy in iridium-doped Fe/MgO magnetic tunnel junctions
Voltage control of spin enables both a zero standby power and ultralow active power consumption in spintronic devices, such as magnetoresistive random-access memory devices. A practical approach to achieve vol...
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Article
Open AccessVoltage controlled interfacial magnetism through platinum orbits
Electric fields at interfaces exhibit useful phenomena, such as switching functions in transistors, through electron accumulations and/or electric dipole inductions. We find one potentially unique situation in...
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Chapter and Conference Paper
Effect of Ca on the Microstructure, Texture and Mechanical Properties in Mg–Zn–Mn Based Alloy
We investigated the role of Ca and hot-rolling condition in the microstructure evolution and mechanical properties in the ZM40 alloy sheets. While the strong basal texture was developed in the as-rolled ZM40 a...
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Chapter and Conference Paper
Strength and Ductility of Ultrafine Grained ZKX600 Mg Alloy
Fully recrystallized ultrafine grained (UFG) Mg-Zn-Zr-Ca alloy was successfully fabricated by a process including high pressure torsion (HPT) and subsequent annealing treatment. After the HPT by one rotation, ...
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Article
Atom probe tomography of metallic nanostructures
This article focuses on four topics that demonstrate the importance of atom probe tomography for obtaining nanostructural information that provides deep insights into the structures of metallic alloys, leading...
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Chapter
Spin Polarization in Heusler Alloy Films
measurements are essential for searching new alloys with high spin polarization. While tunneling magnetoresistance (TMR) measurements have been used to estimate the spin polarization of ferromagnetic (FM) e...
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Article
Rare-Earth Lean Hard Magnet Compound NdFe12N
Among various ThMn12-type rare-earth iron compounds, NdFe11TiN has been known for its large magnetization and high anisotropy field, although their values are smaller than those of Nd2Fe14B and Sm2Fe17N3. Recent ...
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Article
Erratum to: Plasma Nitriding Behavior of Fe-C-M (M = Al, Cr, Mn, Si) Ternary Martensitic Steels
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Article
Plasma Nitriding Behavior of Fe-C-M (M = Al, Cr, Mn, Si) Ternary Martensitic Steels
Change in surface hardness and nitrides precipitated in Fe-0.6C binary and Fe-0.6 mass pct C-1 mass pct M (M = Al, Cr, Mn, Si) ternary martensitic alloys during plasma nitriding were investigated. Surface hard...
